Gyroscope is NOT working with inverted axis in Bluboo Dual in the current Wireless OTA firmware version (3.04). Bluboo service is providing a RAR file with the 3.06 firmware which fixs this, but without any instructions on how to do it.

Power off the phone. Connect it to the USB cable. Press the Download button in the SP Flash Tool, and power on the phone by pressing “Power” and “Volume Up”. Wait until the SP Flash Tool start to moving in the bottom bar. Then wait until it finishes and gives a green big icon saying it’s completed.

That’s it. Then you can boot the phone. Then check in the About Phone section if it shows 3.06 instead 3.04.

Remember to configure the VR Headset using the Android Cardboard app, else you can get double image.